[Ndn-interest] Problem of PIT not aggregating Interests
shijunxiao at email.arizona.edu
Mon Apr 22 19:52:27 PDT 2019
Aggregation vs retransmission depends on exact timing.
Can you capture traffic on the forwarder node as a pcap file with tcpdump?
I can have a look.
Also paste the output of 'nfdc status' and 'nfdc face' and 'nfdc strategy'
On Mon, Apr 22, 2019, 22:16 yjinking at mail.ustc.edu.cn <
yjinking at mail.ustc.edu.cn> wrote:
> We encountered a problem that PIT can not aggregate two Interest packets
> with same name from two different nodes, but it can aggregate two Interest
> packets with same name from one nodes.
> We run NFD on 4 physical nodes consisting "Y"-shape topology(central node
> is forwarder, one Producer, two Consumers). Then two experiment were
> 1. We run ./examples/producer on producer node. We extended Producer's
> execution time to 5 seconds when Producer receives Interest. Then two
> Interest packets with same name from two different nodes were issued nearly
> at the same time. After about 5 second and 10 second, two Consumers
> received their Data packets subsequently. And two Data packets' timestamp
> were different. Producer responded twice.
> 2. In another experiment, all is same with the first experiment, except
> that we only use one consumer node. Two Interest packets with same name
> from one nodes were issued nearly at the same time. After about 5 seconds,
> the consumer node received 2 Data packets with same timestamp subsequently.
> Producer responded once.
> According to the process of NDN, the result of the first experiment is
> very strange. Why didn't PIT aggregate the second Interest? Does NFD build
> PIT for each face separately? or maybe is there anything wrong in our
> Plus, how can I print the content of FIB/CS/PIT on real time? Does NFD
> provide any interfaces?
> Thank you!
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